Process for recovery of sulfur from sour/natural gas using biodegradable carboxylic acid metal chelates
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
공개
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국제특허분류(IPC7판) |
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출원번호 |
US-0396108
(2003-03-25)
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공개번호 |
US-0192995
(2004-09-30)
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발명자
/ 주소 |
- Deshpande, Aniruddha Subhash
- Sankpal, Narendra Vasant
- Kulkarni, Bhaskar Dattatraya
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출원인 / 주소 |
- COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
0 |
초록
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A process for recovery of sulfur from sour/natural gas stream containing H 2 S is described. It involves contacting the stream with an aqueous solution of biodegradable water soluble carboxylic acid metal chelate. This carboxylic acid metal chelate contains an oxidizing polyvalent metal e.g. Fe (II
A process for recovery of sulfur from sour/natural gas stream containing H 2 S is described. It involves contacting the stream with an aqueous solution of biodegradable water soluble carboxylic acid metal chelate. This carboxylic acid metal chelate contains an oxidizing polyvalent metal e.g. Fe (III) and one of the acid from gluconic acid, malic acid, citric acid, succinic acid, oxalic acid. The hydrogen sulfide gas is reduced to hydrogen and elemental sulfur, which is recovered as precipitate. The iron in the metal chelate is reduced in the process and can be regenerated by oxidation.
대표청구항
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1 . A process for recovery of sulfur from sour/natural gas, which comprises contacting the sour/natural gas flow with an aqueous solution of a biodegradable water-soluble carboxylic acid metal chelate till the sour/natural gas coming out of the solution is free from H 2 S, reoxidising the carboxyli
1 . A process for recovery of sulfur from sour/natural gas, which comprises contacting the sour/natural gas flow with an aqueous solution of a biodegradable water-soluble carboxylic acid metal chelate till the sour/natural gas coming out of the solution is free from H 2 S, reoxidising the carboxylic metal chelate solution by passing a source of oxygen through the solution, separating the suspended form of sulfur obtained and drying to obtain sulfur. 2 . A process as claimed in claim 1 wherein the metal chelate comprises a polyvalent metal chelatable in both oxidized and reduced states. 3 . A process as claimed in claim 2 wherein the polyvalent metal is selected from the group consisting of tin, lead, copper, manganese, platinum, tungsten, nickel, palladium, chromium, cobalt, vanadium, titanium, tantalum, zirconium and molybdenum. 4 . A process as claimed in claim 1 wherein the carboxylic acid metal chelate is a transition metal chelate of iron selected from the group consisting of solution of sulfates, nitrates, thiosulfates, chlorides, acetates, oxalates and phosphates. 5 . A process as claim 4 wherein the transition metal salt is chelated with a carboxylic acid. 6 . A process as claimed in claim 5 wherein the carboxylic acid is selected from the group consisting of mono-, di- and tri-carboxylic acids obtained from biodegradable source. 7 . A process as claimed in claim 6 wherein the carboxylic acid is selected from the group consisting of succinic acid, citric acid, malic acid, gluconic acid and oxalic acid. 8 . A process as claimed in claim 1 wherein the solution is maintained at the pH of 7.0 to 9.0 using a hydroxide of an alkaline earth element selected from the group consisting of Na, K and Mg. 9 . A process as claimed in claim 1 wherein the oxygen source is selected from air and molecular oxygen. 10 . A process as claimed in claim 1 wherein the process for recovery of elemental sulfur is selected from a continuous stirred reactor process, bubble column reactor process, airlift type reactor process and a batch process. 11 . A process as claimed in claim 1 wherein the concentration of the chelating agent is in the range of 500 ppm to 20000 ppm. 12 . A process as claimed in claim 1 wherein the sour/natural gas is contacted with the metal chelate solution at ambient temperature and atmospheric pressure.
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